1231875 has 40 divisors (see below), whose sum is σ = 2311760. Its totient is φ = 648000.

The previous prime is 1231873. The next prime is 1231877. The reversal of 1231875 is 5781321.

1231875 = T₁₄₆ + T₁₄₇ + ... + T₂₁₈.

It is an interprime number because it is at equal distance from previous prime (1231873) and next prime (1231877).

It is not a de Polignac number, because 1231875 - 2¹ = 1231873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

1231875 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231873) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16839 + ... + 16911.

It is an arithmetic number, because the mean of its divisors is an integer number (57794).

2^1231875 is an apocalyptic number.

1231875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231875 is a deficient number, since it is larger than the sum of its proper divisors (1079885).

1231875 is an frugal number, since it uses more digits than its factorization.

1231875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 81 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1231875 is about 1109.8986440212. The cubic root of 1231875 is about 107.1985424822.

The spelling of 1231875 in words is "one million, two hundred thirty-one thousand, eight hundred seventy-five".